I powered my trusty old iMac G3 Rev A after about 2 years. It powered right on, and it stayed there, until the sleep timer kicked in and machine went to sleep. When I wanted it to wake up, it did wakeup, sorta, but the screen was blank with the green light on. When I turned it off via a power on button, the green light was still on. Very strange. Even when I turned it back on, there was still green light and the screen was blank. There was also no activity from HDD..

It worked, however, when I disconnected and reconnected it to the mains, then there was the standard orange->green light procedure and the picture came right up.

Any info on that? Thanks

Also there was a arc-like snap about 5 minutes after first turned on. Perhaps a high voltage arced somewhere?